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CoGripedia your encyclopedia of terms used in the industrial flooring industry.



Hydration is the process of cement reacting with water to form a single, solid mass.

Technical Information

When cement hydrates, water binds with the compounds contained in cement on a molecular level. The main product of hydration is CSH, the molecules of which become interconnected; giving concrete its cohesion.

In the early stages of hydration ettringite is formed, which provides concrete with its early setting capacity. Due to the abundance of sulphate ions present this tri-sulphate is easily made, however is likely then broken down to a monosulphate compound, which has less effect on the strength of the concrete.

With the inclusion of cement replacing materials in the cement the hydration process could be extended. Pozzolans such as fly ash and slag, despite their concrete improving properties, can hydrate slower than Portland cement; which must be considered before the concretes placement.

Hydration is an exothermic reaction, meaning the chemical reaction releases heat energy. In large pours, this can cause cracking and noticeable shrinkage.

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